{"id":"CVE-2026-90399","state":"PUBLISHED","title":"wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix stride mismatch in mac_phy_caps_parse()\n\nCurrently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the\nmac_phy_caps buffer as tot_phy_id * len, where len is clamped to\nmin(firmware_len, sizeof(struct ath12k_wmi_mac_phy_caps_params)). The\nsubsequent memcpy() destination advances by sizeof(full struct) per slot\nvia C pointer arithmetic, not by the clamped len. When firmware sends\nshort TLVs, the second and later slots are written past the end of the\nallocation.\n\nThe reader in ath12k_pull_mac_phy_cap_svc_ready_ext() also indexes the\nbuffer with full-struct pointer arithmetic, so the allocation must match\nthat stride.\n\nFix by using kzalloc_objs(), which derives the element size from the\npointer type, making allocation size and pointer stride provably\nconsistent regardless of what len the firmware provides.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3","publishedAt":"2026-09-17T16:09:30.273Z","updatedAt":"2026-10-21T12:51:30.270Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"26f8f87f0a556e7984366c64cebc16d49e15d22f","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"4c6eb712a91fa079be6f9f1419c96e0ad2227081","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath12k/wmi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath12k/wmi.c"]}],"references":["https://git.kernel.org/stable/c/79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f","https://git.kernel.org/stable/c/d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b","https://git.kernel.org/stable/c/b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a","https://git.kernel.org/stable/c/26f8f87f0a556e7984366c64cebc16d49e15d22f","https://git.kernel.org/stable/c/4c6eb712a91fa079be6f9f1419c96e0ad2227081"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90399.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90399","state":"PUBLISHED","datePublished":"2026-09-17T16:09:30.273Z","dateUpdated":"2026-10-21T12:51:30.270Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.811Z"},"containers":{"cna":{"title":"wifi: ath12k: fix stride mismatch in mac_phy_caps_parse()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix stride mismatch in mac_phy_caps_parse()\n\nCurrently, in ath12k_wmi_mac_phy_caps_parse(), kzalloc() sizes the\nmac_phy_caps buffer as tot_phy_id * len, where len is clamped to\nmin(firmware_len, sizeof(struct ath12k_wmi_mac_phy_caps_params)). The\nsubsequent memcpy() destination advances by sizeof(full struct) per slot\nvia C pointer arithmetic, not by the clamped len. When firmware sends\nshort TLVs, the second and later slots are written past the end of the\nallocation.\n\nThe reader in ath12k_pull_mac_phy_cap_svc_ready_ext() also indexes the\nbuffer with full-struct pointer arithmetic, so the allocation must match\nthat stride.\n\nFix by using kzalloc_objs(), which derives the element size from the\npointer type, making allocation size and pointer stride provably\nconsistent regardless of what len the firmware provides.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"26f8f87f0a556e7984366c64cebc16d49e15d22f","versionType":"git"},{"version":"d889913205cf7ebda905b1e62c5867ed4e39f6c2","status":"affected","lessThan":"4c6eb712a91fa079be6f9f1419c96e0ad2227081","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath12k/wmi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath12k/wmi.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/79c6f4f7d16eea1bcb8bc5c8fd6ec04a01b0614f"},{"url":"https://git.kernel.org/stable/c/d3355e0fdbbf531ca8b82a6a3feb80a1b7306a8b"},{"url":"https://git.kernel.org/stable/c/b9a5d12cbdeb860306f8d47c92caee0ea6ee0e0a"},{"url":"https://git.kernel.org/stable/c/26f8f87f0a556e7984366c64cebc16d49e15d22f"},{"url":"https://git.kernel.org/stable/c/4c6eb712a91fa079be6f9f1419c96e0ad2227081"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The malformed bytes are WMI_TAG_MAC_PHY_CAPABILITIES TLVs inside WMI_SERVICE_READY_EXT_EVENTID, DMA'd from the ath12k firmware Copy Engine (ath12k_ce_recv_process_cb → ath12k_htc_rx_completion_handler → ath12k_wmi_op_rx → ath12k_service_ready_ext_event → ath12k_wmi_mac_phy_caps_parse). That is PCIe/AHB host-firmware WMI, not an 802.11 frame.\nAC:L - Firmware sets tot_phy_id via fls(phy_id_map) in ath12k_wmi_hw_mode_caps_parse and the TLV length (no min_len for WMI_TAG_MAC_PHY_CAPABILITIES). Any tot_phy_id>=2 with len < sizeof(struct ath12k_wmi_mac_phy_caps_params) makes memcpy of slot 1+ land past the tot_phy_id*len kzalloc; no race or layout lottery.\nPR:N - The CE/HTC WMI receive path has no capable() or authentication check; ath12k_service_ready_ext_event parses whatever firmware posts. A compromised or malicious WCN7850/QCN9274 firmware needs no Linux account.\nUI:N - ath12k_core_start() blocks in ath12k_wmi_wait_for_service_ready() during probe and crash recovery (ath12k_core_reconfigure_on_crash); the overflow runs when that event arrives, with no victim ioctl, mount, or iface config.\nS:U - The GFP_ATOMIC heap overflow is in the host kernel's mac_phy_caps buffer allocated by ath12k_wmi_mac_phy_caps_parse. Impact stays in that kernel; this is not a KVM/Xen escape or IOMMU DMA-remapping bypass.\nC:H - memcpy writes firmware-chosen payloads at full-struct strides past a short tot_phy_id*len object, and ath12k_wmi_save_all_mac_phy_info()/ath12k_pull_mac_phy_cap_svc_ready_ext() then read that heap with the same stride, giving a high-confidentiality primitive from adjacent objects.\nI:H - Each overflowing slot is an out-of-bounds write of firmware-controlled contents (up to just-under-sizeof(struct ath12k_wmi_mac_phy_caps_params) bytes) into the kernel heap, enabling adjacent-object corruption and control-flow hijack.\nA:H - The same OOB write, and the later full-struct walk of the undersized mac_phy_caps buffer in ath12k_wmi_save_all_mac_phy_info(), can smash heap metadata or adjacent pointers and oops/panic the kernel."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:51:30.270Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}